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ALBERT. GOMTE DE DION, G. T. BOUTON 8a G. TREP ARDO UX. STEAM BOILER. 7

No. 291.580. Patented Jan. 8, 1884.

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J MWQ M $223M MW I w UNITED: STATES PATENT (barren.

ALBERT conrn DE DIoN, ononens THADEE nouroN, AND CHARLES TREPARDOUX, on PARIS, FRANCE.

STEAM-BOILER.

SPECIFIQATION forming part of Letters Patent No. 291,580, dated Januaiy 8, 1884. Application filed November 3, 1883. No model.) Patented in France May 1, 1883, No. 155,206.

To (all whom it may concern-.-

Beit known that we, ALBERT coMTE DE DIoN, GEORGES THADEE Booron, and GHARLES TREPARDOUX, citizens of the Republic of France, residing at Paris, in the said Republic, have invented certain Improve ments in Steam-Boilers, of which the following is a specification, referencebeinghad to the accompanying drawings.

This invention consists in a boiler composed of two principal portionsviz., an external body and an internal tubular portion, the latter comprising a truncated conical shell, a central tube or water-pocket, a series of inclined radiating watertubes between said shell and central tube or pocket, and'a series of smoketubesthe said two principal portions being either permanently united, or, preferably,united by screws, screw-bolts, and nuts in such manner as to provide for their being easily separated'whenever desirable for examination, cleaning, or repair, and as easily reunited.

Figure 1 is a central vertical section of a boiler illustrating our invention. Fig. 2 is a horizontal sect-ion of the same in the line an m,- Fig. 3, an elevation of the tubular internal portion of the boiler detached from the body or external portion thereof. Fig. 4 is aplan corresponding with Fig. 3. Fig. 5 is a vertical section of the upfier part of a boiler exhibiting amodification of our invention. Fig. 6 is an inverted plan corresponding with Fig. 5.

Similar letters of reference indicate corre sponding parts in the several figures.

The external portion or body of the boiler illustrated by Figs. 1., 2, 3, 4 is composed of an upright cylinder, A, and a crown-plate, B, which may be either flat or slightly conical externally, and in the'center of which is represented a dome, O, which may be of ovoid or cylindrical form, from which opens the steampipeD.

Theinternal or tubular portion of the boiler consists of a shell, E I, of truncated conical form, having an open bottom, avertical tube having a closed bottom and open top, depending centrally from the crown I of said shell, and a series of radiating inclined tubes smaller than E, connecting the latter with E. These tubes G may be arranged in quincunx, or helically, in order that they may be well. exposed to the heat from the fire in the furnace, which is intended to be arranged below the conical shell I. The crown I of the conicalshell E I has fitted to and permanently secured in ita number of fire-tubes, J, intended for the passage-of the products of combustion from the fire below into the chimney-base or smoke-box M, which is erected on the crownsheet B and covers the said tubes and the stea'nndome C. These tubes J J pass through and are secured to the crown-plate B by nuts a a, fitted to screw-threads on the exteriors of said pipes, and the lower part of the conical shell E I is secured to the bottom of the body A by flanges on each and screw-bolts K K, passing through said flanges. The removal of the nuts from the bolts K K and the nuts a a from the tubes J J permits the whole of the internal portion of the boiler, which is shown in Fig. 3, to be separated from the external portion, to facilitate transportation when desirable, and to afford easier access to the parts for examination and repair.

The water-space of the boiler consists of the annular space between the external cylinder, A, and the conical shell E I, the central tube or pocket, F, the tubes G G, anda portion of the interior of the cylinder above the conical shell E I.

Some distance above the open upper end or mouth of the tube or pocket F there is supported on the crown I a cap-plate, H, which, while allowing free passage of the bubbles of steam generated in the tubes G F, prevents them from being thrown too rapidly into the steam-chamber above, and from carrying water up into the dome G and into the steam-pipe D.

Above the crownsheet B is a feed-water reservoir, L, which surrounds thechiinney-base or smoke-box, so that the water therein may be heated by the escaping gaseous products of combustion. This reservoir and the chimneybase may be one structure, the chimney-base being composed of the inner walls of the reservoir.

In the modification of our invention shown in Figs. 5 and 6 the only change from what is shown in Figs. 1, 2, 3, a, and which has been hereinabove described, is that the dome 0 shown in Fig. 1 is replaced by a sphere or cylinder, N, connected with the crown sheet B by steam-tubes O 0, arranged between the smoke-pipes J J, as shown in Fig. 6.

If it be not desired to make the two parts of the boiler separable, the tubes J J may be expanded into the crown-sheet, and the joint between the bases of the cylinder A and conical shell E may be riveted.

This steam-boiler possesses the following advantages, viz: First. it contains little water, and therefore its weight, when filled, is comparatively small; second, this water is divided into a great number of thin streams by and distributed over a very great heating-surface, consisting of the inclined tubes G, whence result a rapid evaporation and a sufficiently active circulation to prevent burning of the boiler; third, the conical form of the shell E and the inclined arrangement of the tubes G allow the said shell and tubes to expand and conl tract freely withoutinj ury to thejoints; fourth, the cleaning of the tubes both externally and internally is rendered easy by the removal of the entire tubular portion of the boiler, (shown in Fig. 3,) which permits all the tubes to be examined and brushed; fifth, the hot gases which have not been utilized by the cluster of tubes pass into the pipes J and transmit a part of their heat to the interior of the boiler and part with the last portion of the heat to the exterior of the dome G and the inner walls of the reservoir L, which contains the feed-water, in such manner as on the one part to dry the 35.

steam and on the other part to heat the feedwatcr.

This boiler may be placed over a furnace or fire-place of any construction whatever, or, if

of small dimensions, may be placed over a gasburner or lamp.

Vhat we claim as our invention, and desire to secure by Letters Patent, is-

The combination, in a steam-boiler. of two principal separable parts, one of which consists of an upright cylindrical external body,

and the other of which consists of an internal conical shell, a central water-pocketdepend ing from said shell, inclined water-tubes radiating between said shell and pocket, and line tubes attached to said shell, the said separable parts being united bynuts and screw-threads, connecting the said fire-tubes with the crown of the body. and the bases of the said body and" shell being united by screw-bolts, substantially as herein described.

In testimony whereof we have signed this specification in the presence of two subscribing witnesses. 

